Notice of a new signal-light for railways /
Stevenson, Alan,1807-1865.
[Edinburgh? : s.n.,
1841?]
Caption title.
"From the Edinburgh new philosophical journal for April 1841".--below caption title.
"Read before the Society of Arts for Scotland, 22d February 1841".--at foot of page [1]
Beacons
Railroads
Scotland Edinburgh.